AP Twitter Account Hacked, Tweet About Obama Shakes Market : The Two-WayIt quickly became clear that the "news" was not true. There had been no explosions at the White House and President Obama was fine. But a message on the wire service's Twitter account rattled investors.

For a very brief moment today, some people thought that terrorists had struck the U.S. again. That's because of this tweet from the Associated Press. It read, breaking: Two explosions in the White House and Barack Obama is injured. It was false. The AP's Twitter account had been hacked.

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But that single tweet sent Wall Street tumbling. The Dow Jones fell more than 150 points before recovering after it was revealed that the tweet was a fake. A group calling itself the Syrian Electronic Army is claiming responsibility for the hack as well as recent hacks at CBS's "60 Minutes," the BBC and here at NPR.

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